Boston forced Memphis into 1-for-16 shooting to start the fourth.

MEMPHIS, Tenn. (AP) — Kyrie Irving didn’t get off to a very good start, so he and the Boston Celtics made sure to finish with a flurry.

Irving scored 22 of his 26 points in the second half, Al Horford converted a pair of late 3-pointers to finish with 18 points and the Celtics erased a 19-point, second-half deficit to beat the Memphis Grizzlies 112-103 on Saturday night.

“At the half, Kyrie just challenged all of us to be better,” Horford said of the difference after Boston trailed 64-47 at intermission. “The coach as well. I felt like we came out with better energy, played much harder.”

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Irving’s halftime talk had to deal with his own game as well. He was limited to four shots in the first half and four points. That approach changed in the second half as Irving became more aggressive and got to the basket more often.

“Offensively, I felt like they were trying to take the ball out of my hands,” Irving said, adding the Celtics were more active off the ball in the second half. “You don’t have to touch the basketball every single play down to be effective. You can be effective doing the little things. That’s what we did in the second half.”

But there still was the matter of overcoming the 19-point deficit in the third quarter. Boston started it with an 11-2 run in the closing minutes of the third. Then, Memphis opened the fourth missing 15 of its first 16 shots. By that point, Boston had overtaken the Grizzlies. Memphis would hold a 97-96 lead before the Celtics rattled off a 12-4 rally that included a pair of 3-pointers from Horford to collect the win.

“We didn’t do a good job of defending the 3-point line,” Memphis coach J.B. Bickerstaff said after Boston was 9 of 18 behind the arc in the second half.

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“We allowed them to shoot 44 percent from the 3-point line (for the game), and that was the difference.”

Marcus Morris scored 22 points for Boston, and Gordon Hayward had 14 off the bench.

Tip-ins

Celtics: Rookie F Robert Williams missed his second straight game with a left groin strain. . Boston has won last four in the series. … Horford’s five 3-pointers matched his career high set against Houston on Dec. 29, 2015.

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Grizzlies: Gasol has made a 3-pointer in 12 straight games, one short of his career-best 13 in December 2017. . Brooks was 4 of 5 from outside the arc. . Gasol had 10 assists.

Defending Conley

Bickerstaff doesn’t think Conley gets the respect from officials that his point guard deserves. Bickerstaff pointed to a play where he believed Conley was slapped on the arm on a drive to the basket. Bickerstaff said it was a game-changer, calling it a “huge missed call.”

“I think it’s been a running theme in the conversations that we’ve had about the fouls that Mike Conley gets that aren’t blown. Mike Conley is one of the class acts in the NBA. He serves the respect of the officials. Time and time again, he drives to the basket, there’s contact made, but there’s no whistle. . He doesn’t get the respect that I feel that some of these other guys at his level do.”

Fatigue sets in

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Celtics second-year forward Guerschon Yabusele played a season-high 16 minutes, including significant minutes in the fourth before Horford returned with 4:47 left in the game. “I’m not going to lie, I’m really, really tired,” he said.